/**
 * Copyright (C) 2006 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.inject.internal.util;

import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.LogRecord;
import java.util.logging.Logger;

/**
 * Enables simple performance monitoring.
 *
 * @author crazybob@google.com (Bob Lee)
 */
public final class Stopwatch {
  private static final Logger logger = Logger.getLogger(Stopwatch.class.getName());

//  static {
//      logger.setLevel(Level.ALL); 
//      logger.addHandler( new Handler() {
//
//        @Override
//        public void publish(LogRecord record) {
//            System.out.println("Stopwatch--"+record.getMessage());
//        }
//
//        @Override
//        public void flush() {
//            
//        }
//
//        @Override
//        public void close() throws SecurityException {
//            
//        }
//          
//      });
//  }
  
  private long start = System.currentTimeMillis();

  /**
   * Resets and returns elapsed time in milliseconds.
   */
  public long reset() {
    long now = System.currentTimeMillis();
    long l = now - start;
    start = now;
    return l;
  }

  /**
   * Resets and logs elapsed time in milliseconds.
   */
  public void resetAndLog(String label) {
    logger.fine(label + ": " + reset() + "ms");
  }
}
